Second order ferro-paraelastic phase transition in the layer crystal (n-C3H7NH3)2 ZnCl4 at 310 K
- 1 March 1982
- journal article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 76 (5) , 2610-2617
- https://doi.org/10.1063/1.443241
Abstract
Bis-propylammonium tetrachloro-zincate (II) shows a second order ferro-paraelastic phase transition with a Pnma-P21/n symmetry change at 310.20±0.02 K. Experimental studies involving the description of both structures from x-ray measurements as well as thermal and optical measurements allow us to characterize this phase transition. It is equitranslational and is described by means of an order parameter which transforms according to the irreducible representation B3g of space group Pnma. The critical behavior of the spontaneous monoclinic shear u4, the spontaneous birefringence and the specific heat suggest that this compound may belong to the group of ’’proper ferroelastics’’ for which the Landau theory is strictly valid. A soft mode discussion that accounts for the displacive part of this phase transition and a phenomenological approach following Landau’s theory are carried out. Finally, a possible order–disorder contribution is also discussed.Keywords
This publication has 16 references indexed in Scilit:
- Physical properties and phenomenological theory around the successive high-temperature phase transitions of (C2H5NH3)2CuCl4Journal of Physics C: Solid State Physics, 1981
- High-temperature phase transitions in (CnH2n+1NH3)2ZnCl4 CompoundsPhysica Status Solidi (a), 1980
- Structural phase transitions in perovskite layer structuresFerroelectrics, 1980
- Calorimetric study of order—disorder phase transitions in long-chain (CnH2n+1NH3)2CuCl4 compoundsPhysica Status Solidi (a), 1978
- Study of the first-order phase transition of (C3H7NH3)2CdCl4 at 183 K by X-ray diffraction of the two phasesActa Crystallographica Section B: Structural Science, Crystal Engineering and Materials, 1978
- Layer perovskites of the (CnH2n+1NH3)2MX4 and NH3(CH2)mNH3MX4 families with M = Cd, Cu, Fe, Mn OR Pd and X = Cl OR Br: Importance, solubilities and simple growth techniquesJournal of Crystal Growth, 1978
- X-ray study of the first-order phase transition Pcab–Bmab in (CH3CH2NH3)2CdCl4Physica Status Solidi (a), 1977
- Bis(n-dodecylammonium) tetrachlorozincateActa Crystallographica Section B: Structural Science, Crystal Engineering and Materials, 1977
- Monomethylammonium tetrachlorozincate(II)Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials, 1976
- X-ray scattering factors computed from numerical Hartree–Fock wave functionsActa Crystallographica Section A, 1968